Fix the YCM tests on Mac.

tools/vim/chromium.ycm_extra_conf.py

Index: tools/vim/chromium.ycm_extra_conf.py
diff --git a/tools/vim/chromium.ycm_extra_conf.py b/tools/vim/chromium.ycm_extra_conf.py
index e9397ce25420ce40e68f3e21ecb48cd94107a866..0db23070032748e7a09c24879f04cca83c70867a 100644
--- a/tools/vim/chromium.ycm_extra_conf.py
+++ b/tools/vim/chromium.ycm_extra_conf.py
@@ -80,7 +80,7 @@ def FindChromeSrcFromFilename(filename):
     (String) Path of 'src/', or None if unable to find.
   """
   curdir = os.path.normpath(os.path.dirname(filename))
-  while not (os.path.basename(os.path.realpath(curdir)) == 'src'
+  while not (os.path.basename(curdir) == 'src'
              and PathExists(curdir, 'DEPS')
              and (PathExists(curdir, '..', '.gclient')
                   or PathExists(curdir, '.git'))):
@@ -159,7 +159,7 @@ def GetNinjaBuildOutputsForSourceFile(out_dir, filename):
   """
   # Ninja needs the path to the source file relative to the output build
   # directory.
-  rel_filename = os.path.relpath(os.path.realpath(filename), out_dir)
+  rel_filename = os.path.relpath(filename, out_dir)
 
   p = subprocess.Popen(['ninja', '-C', out_dir, '-t', 'query', rel_filename],
                        stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
@@ -320,7 +320,7 @@ def GetClangOptionsFromNinjaForFilename(chrome_root, filename):
 
   sys.path.append(os.path.join(chrome_root, 'tools', 'vim'))
   from ninja_output import GetNinjaOutputDirectory
-  out_dir = os.path.realpath(GetNinjaOutputDirectory(chrome_root))
+  out_dir = GetNinjaOutputDirectory(chrome_root)
 
   clang_line = GetClangCommandLineFromNinjaForSource(
       out_dir, GetBuildableSourceFile(chrome_root, filename))